TY - JOUR

T1 - Characterization of impregnated GDC nano structures and their functionality in LSM based cathodes

A1 - Klemensø,Trine

A1 - Chatzichristodoulou,Christodoulos

A1 - Nielsen,Jimmi

A1 - Bozza,Francesco

A1 - Thydén,Karl Tor Sune

A1 - Kiebach,Wolff-Ragnar

A1 - Ramousse,Severine

AU - Klemensø,Trine

AU - Chatzichristodoulou,Christodoulos

AU - Nielsen,Jimmi

AU - Bozza,Francesco

AU - Thydén,Karl Tor Sune

AU - Kiebach,Wolff-Ragnar

AU - Ramousse,Severine

PB - Elsevier BV North-Holland

PY - 2012

Y1 - 2012

N2 - Porous composite cathodes of LSM–YSZ (lanthanum strontium manganite and yttria stabilized zirconia) were impregnated with GDC (gadolinia doped ceria) nano particles. The impregnation process was varied using none or different surfactants (Triton X-45, Triton X-100, P123), and the quantity of impregnated GDC was varied via the precursor concentration and number of impregnation cycles. The obtained structures were characterized with Kr and N2 adsorption/desorption isotherms, mercury intrusion porosimetry, in-situ high temperature X-ray diffraction, scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). The performance of the impregnated LSM–YSZ cathode was correlated with the GDC load, and the density and connectivity of the GDC phase, whereas crystallite size and surface area appeared less significant. The impregnated GDC was indicated to be preferentially situated on the LSM phase and the LSM grain boundaries. The observations suggest that the improved performance associated with GDC nano particles is related to the particles placed near the TPB (triple phase boundary) zone. The GDC extends the TPB by creating an ionic conducting network on top of the LSM particles and on top of the insulating low conducting zirconates at the LSM–YSZ interface.

AB - Porous composite cathodes of LSM–YSZ (lanthanum strontium manganite and yttria stabilized zirconia) were impregnated with GDC (gadolinia doped ceria) nano particles. The impregnation process was varied using none or different surfactants (Triton X-45, Triton X-100, P123), and the quantity of impregnated GDC was varied via the precursor concentration and number of impregnation cycles. The obtained structures were characterized with Kr and N2 adsorption/desorption isotherms, mercury intrusion porosimetry, in-situ high temperature X-ray diffraction, scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). The performance of the impregnated LSM–YSZ cathode was correlated with the GDC load, and the density and connectivity of the GDC phase, whereas crystallite size and surface area appeared less significant. The impregnated GDC was indicated to be preferentially situated on the LSM phase and the LSM grain boundaries. The observations suggest that the improved performance associated with GDC nano particles is related to the particles placed near the TPB (triple phase boundary) zone. The GDC extends the TPB by creating an ionic conducting network on top of the LSM particles and on top of the insulating low conducting zirconates at the LSM–YSZ interface.

KW - Solid oxide fuel cell electrode

KW - Impregnation

KW - Infiltration

KW - Nano particle

KW - Triple phase boundary

KW - Meso porous materials

U2 - 10.1016/j.ssi.2012.07.011

DO - 10.1016/j.ssi.2012.07.011

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

VL - 224

SP - 21

EP - 31

ER -